JPH0624756A - Production of glass product - Google Patents

Abstract

PURPOSE:To provide a method for efficiently producing a glass product without any remaining unevennesses or stripe patterns such as baffle marks or shear marks on the outer surface of the glass product. CONSTITUTION:The objective method for producing a glass product 3 is to feed a molten glass gob 1 into a blank mold 8, form a parison 2, then transfer the resultant parison 2 to a finish mold 20 and carry out the blow molding. In this method, the outer surface of the bottom of the formed parison 2 is subjected to fire polishing after forming the parison 2 and before transferring the parison 2 to the finish mold 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass product manufacturing method, and more particularly to a glass product manufacturing method in which no baffle mark or shear mark is left on the outer surface of a glass product.

[0002]

2. Description of the Related Art As a method for removing irregularities and stripes formed on the inner surface of glass products during manufacturing, a fire polishing method disclosed in, for example, Japanese Patent Publication No. 51-29174 is known.

According to this method, a glass product immediately after press molding is taken out of a mold or immediately after press molding, and its inner surface is heated by a burner to be remelted to form a smooth surface.

[0004]

By the way, generally, in glass products for lighting, etc., the baffle generated on the outer surface in the above-mentioned manufacturing process is required because the outer surface is required to be smooth in terms of lighting effects and appearance. It is desirable that marks and shear marks be removed because they reduce the commercial value.

However, in the case where a large number of glass products for lighting and the like are taken in a usual multi-parallel type individual molding machine (individual section machine), baffle marks are generated in the parison molding stage in the molding process, or It was not possible to prevent the occurrence of shear marks at the cuts when the gob was formed by cutting the molten glass in the previous step.

However, in the above-described conventional fire polishing method, even if the inner surface of the glass product can be made smooth, it is possible to remove the irregularities and striped patterns such as baffle marks and shear marks formed on the outer surface thereof. I couldn't. In addition, the fire polishing after press molding requires post-processing, and it takes time for remelting and it is difficult to obtain a good finish.

The present invention has been made in view of such circumstances.
It is an object of the present invention to provide a highly efficient glass product manufacturing method that does not leave unevenness or stripes such as baffle marks and shear marks on the outer surface of glass products.

[0008]

In order to achieve the above-mentioned object, the present invention sends a molten glass gob to a rough mold to form a parison, transfers the parison to a finishing mold, and blow-molds the parison. In the method of manufacturing a glass article, after the parison is formed and before the parison is transferred to the finishing die, the bottom outer surface of the formed parison is fire-polished.

[0009]

[Function] After the parison is formed, the outer surface of the bottom of the parison can be subjected to fire polishing to remove the shear mark generated in the preceding process and the baffle mark generated during the formation of the parison. By transferring the parison to a finishing die and performing finish molding, the outer surface of the bottom can be finished smoothly.

The above-mentioned fire polishing is extremely effective because it is performed while the parison is still in a high temperature state immediately after the baffle is evacuated by the gas burner arranged corresponding to the rough mold for forming the parison.
A good smooth surface can be easily obtained without taking time.

Therefore, by incorporating this fire polishing process in the final stage of the process, there is no hindrance to the subsequent transfer process or finishing process,
Efficient glass manufacturing process can be assembled.

[0012]

EXAMPLES The method of the present invention will be described in detail below with reference to examples. FIG. 1 shows an overall schematic configuration of a large number of parallel glass bottle individual molding machines. In the figure, reference symbol A cuts a molten glass discharged from a feeder portion of a glass melting furnace (not shown) into a predetermined length by a cutting machine. It is a delivery device for distributing the gobs (molten glass gobs) 1 thus formed into the respective rough mold process sections.

B is a rough mold device for preliminarily rough-forming the gob 1 distributed and supplied from the delivery device A to form a parison 2, and C is a transfer of the parison 2 formed in the rough mold process to a finishing mold process. D is a finishing device for finally blow-molding the parison 2 transferred by the transferring device C into a product shape, and E is a finishing product device D for taking out the glass product 3 and carrying it out. It is the take-out device that is moved to F.

In the above-mentioned rough mold step, after the parison is formed and before the parison 2 is transferred to the finishing mold step, a heating device G for fire polishing the bottom outer surface of the parison 2 is set up near the rough mold device B. It is set up. The heating device G has a gas burner 10 attached to an arm 9b which is horizontally fixed to a piston rod 9a of an air cylinder 9. The outer surface of the bottom of the parison 2 roughly formed by the mold 8 can be fire-polished.

After the parison is formed by such a heating device G and before the parison 2 is transferred to the finishing device D,
The outer surface of the bottom of the molded parison 2 can be subjected to fire polishing to remove baffle marks formed during parison formation, shear marks formed during the preceding gob forming step, and the like to make the surface smooth. As will be described later, this fire polishing is performed immediately after the baffle 11 is evacuated and the rough mold is opened after the parison 2 is formed by the pressing process, so that the parison 2 is still in a high temperature state, which is extremely efficient. Marks can be removed effectively and effectively, and such a pre-smoothed parison 2 can be transferred to a finishing device to obtain a glass product 3 having a smooth and glossy outer surface. .

More specifically, the delivery device A
Is composed of a scoop 5, a trough 6 and a deflector 7 connected to a scoop cylinder 4, and the scoop 5 is moved to correspond to each rough mold process section to sequentially move the gob 1 to the rough mold 8.
It is designed to be put inside.

The rough mold 8 of the rough mold device B is opened in the vertical direction and is formed in two split shapes, and is opened and closed by a cylinder device (not shown), and a plunger 13 is inserted into the rough mold 8 from below the lower opening thereof. Is attached to the tip of the piston rod 14a of the air cylinder 14, while the upper opening of the rough mold 8 is
A baffle 11 that moves so as to close it is attached to the tip of the piston rod 12a of the air cylinder 12, and the jet opening of the gas burner 10 can be made to face the upper opening of the rough mold 8 as described above. Heating device G is provided.

To the gas burner 10 of the heating device G, for example, butane gas, air, and oxygen gas may be fed through a mixer 10a at a ratio of 1: 5: 0.3, and a combustion medium may be supplied thereto. It goes without saying that a mixture of appropriate combustion gases in a desirable ratio may be used without limitation. Further, since the baffle mark and the shear mark often appear in a substantially ring shape, the shape of the gas burner 10 is preferably a ring shape corresponding to this, but of course, it is not limited to this. Instead, it may be radial, for example.

The above-mentioned rough mold 8 has a funnel shape at its upper opening, that is, a bottom part, and a so-called post-baffle system capable of smoothly performing gobins without using a funnel as a guide link can be applied. In the invention, by adopting this post baffle system, the above-mentioned heating device G can be arranged very easily by utilizing the conventional funnel mechanism. In other words, in the present embodiment, the air cylinder 9 of the heating device G is the one that conventionally supports the funnel, and is used as it is, so that the layout can be effectively used without the need for a new addition. However, the present invention is not limited to the above-described post baffle system, and a heating device may be separately provided to operate in synchronization with glass forming.

On the other hand, below the rough mold 8, a plunger 13 which projects into the interior from the lower opening of the rough mold 8 is attached to the tip of the piston rod 14a of the air cylinder 14 and is vertically movable. , Plunger 13 in rough mold 8
To form a parison 2.

The lower opening of the rough mold 8 at the time of forming the parison, that is, the mouth mold (not shown) which is in contact with the mouth portion, is formed in two split shapes, and is formed by the neck ring mechanism 15 via the holder 16. The opening / closing operation and the transfer operation are performed. After the parison is formed, the holder 16 is rotated by 180 degrees by the cylinder 17 and the parison 2 held by the mouth mold is inverted and transferred from the rough mold 8 to the finishing mold device D. Is able to.

The finishing die unit D is a bottom die 19 supported by a height-adjustable supporting means 18, and a bottom die 19 is opened and closed by a cylinder device (not shown) into two pieces. The finishing die 20 is formed, and the blow head 22 is attached to the piston rod 21a of the air cylinder 21 via the arm 21b and is vertically movable with respect to the upper opening of the finishing die 20. The parison 2 transferred from the rough mold 8 is blow-molded in the finishing mold 20 by the mold device D, and final finishing is performed. Since the parison 2 transferred to the finishing device D has already been fire-polished in the roughing process to remove baffle marks and shear marks in advance, a glass product 3 having a smooth and glossy outer surface can be obtained. it can.

The take-out device E includes an air cylinder 25 having a vertically elongated piston rod 25a having a rack, a tongue arm 26 having a pinion meshing with the rack, and a tongue arm 26 supporting the tongue arm 26 for the glass product 3. With the tong head 27 capable of gripping the portion, the take-out device E is used to transfer the glass product 3 from the finishing device D to the carry-out line F in the same posture.

In the carry-out line F, a dead plate 29 having a small hole, a conveyor 30 adjacent to the dead plate 29, and a cold air duct arranged below the dead plate 29 and the conveyor 30.
31 and a pusher 32 that moves from the dead plate 29 toward the conveyor 30 are provided, and the glass product 3 transferred onto the dead plate 29 by the take-out device E is cooled by the cool air from the cool air duct 31 at the bottom. While conveyor 30
It is supposed to be shipped in.

The air cylinders and the like constituting the drive system of each device including the heating device G for performing the above-mentioned fire polishing are linked according to a predetermined program by a valve block system or an electro timing system. It is driven, and any method may be adopted. Although illustration is omitted, for example, in the valve block system, a valve that supplies and discharges air to each air cylinder or spool valve is arranged corresponding to a rotationally driven timing drum, and the valves arranged on the timing drum are arranged. Stud (ON button)
And a high stud (OFF button) are used to turn on / off each air cylinder or spool valve at appropriate timing. Further, in the electro timing system, a motor controlled and driven by a frequency is used as an actuator.

The operation of the multiple parallel glass bottle individual molding machine configured as described above will be described below. The gob 1 is thrown into the closed rough mold 8 from the deflector 7, and so-called gob-in is performed. After lowering the baffle 11 to close the upper opening (bottom) of the rough mold 8, the plunger 13 is lifted and the parison 2 is formed by press molding. After raising the baffle 11 and retracting it, retracting the plunger 13 downward and opening the rough mold, the gas burner 10 is moved to a position above the bottom of the parison 2 by a predetermined distance and ignited. To heat. At this stage parison 2
Is in a high temperature state, a good fire polishing effect can be obtained by heating for a very short time, and baffle marks and shear marks can be removed cleanly. After the fire polishing is completed, the gas burner 10 is lifted up and retracted, and the parison 2 is transferred to the bottom plate 19 of the finishing mold apparatus D while being held in the mouth mold. After closing the finishing die 20 so as to surround the parison 2 on the bottom plate 19 and opening the mouth die for reverting, the blow head 22
And pressurized air is blown into the parison 2 for about 5 seconds to finish the molding. The glassware 3
There is no baffle mark or shear mark on the outer surface, and it is smooth and glossy, and it is possible to obtain a good-looking glass product 3 which is particularly suitable for lighting and as a high-grade container. Next, after the blow head 22 is raised and retracted, the blow head 22 is gripped by the tongue head 27, the finishing die 20 is opened, and the glass product 3 is transferred to the carry-out line F and carried out.

As described above, by performing the fire polishing efficiently at the very early stage of the bottle molding process by the post baffle system, the unnecessary marks can be effectively removed without performing the troublesome post-processing. , The finish is also very good. Moreover, the heating device G for performing the fire polishing
Can be compactly arranged in the vicinity of the rough mold device B by using a funnel cylinder, and does not require any additional material, does not require space, and can perform the method at low cost. I was able to.

[0028]

As described above, according to the method of the present invention, after the parison is formed and before the parison is transferred to the finishing die, the outer surface of the bottom portion of the formed parison is fire-polished. The shear mark can be removed cleanly, and a glass product with a smooth surface and gloss can be efficiently obtained. The heating device for the fire polishing can be easily incorporated into a normal multi-parallel glass bottle individual molding machine, and the fully automatic molding system can establish a highly efficient mass production system that rotates quickly. In addition, by combining the post baffle system, there is no need for major changes to the conventional layout,
It is also a great advantage that the present method can be implemented at a low cost by only slightly changing the device.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram showing an example of multiple parallel glass bottle individual molding machines by a post-baffle method for carrying out the method of the present invention.

[Explanation of symbols]

1 ... Gob (molten glass gob) 2 ... Parison, 3 ... Glassware, 8 ... Coarse mold, 20 ... Finishing mold.

Claims (1)

[Claims] 1. A method for producing a glass product by feeding a molten glass gob into a coarse mold to form a parison, transferring the parison to a finishing mold, and then blow molding the parison, wherein the parison is formed and then the parison is finished. A method of manufacturing a glass product, which comprises subjecting a bottom outer surface of the molded parison to a fire polishing before being transferred to a mold.